主动围压下岩石的冲击力学性能试验研究

利用具有主动围压加载装置的直径为100 mm分离式Hopkinson压杆（SHPB）试验装置和薄圆形紫铜片作为波形整形器，研究了斜长角闪岩在不同围压等级（0~6 MPa）、不同应变速率（50~170 s-1）下的动态力学性能，并对试验有效性进行了分析。试验结果表明：斜长角闪岩的动态强度增长因子与应变率的对数呈近似线性关系，强度与比能量吸收随应变率的增加而近似线性增加，体现了显著的应变率相关性；在同等级应变率范围内，随着围压的增加，岩石的增强效果与增韧效果逐渐增强；同时发现，在围压作用下，岩石的破坏由拉伸破坏向压剪破坏逐渐过渡和发展。SHPB试验中，近似恒应变率加载时间比例约为69.5 %，能够较好地满足应力均匀分布及近似恒应变率加载要求，表明SHPB试验的有效性和结果的可靠性

Experimental study on rock's mechanical capabilities under impact loading with confining pressure

In order to investigate rock's dynamic compression capabilities,amphibolites were subjected to impact with different confining pressures(0 ~ 6MPa) and strain rates(50~170s-1) by using the split Hopkinson pressure bar(SHPB) of 100 mm diameter with a confining pressure device and a thin red copper circular plate as pulse shaper.The validity of SHPB experiment was analyzed.Experimental results show that the dynamic compressive strength and specific energy absorption of amphibolites are strain-rate dependent;th...